Sansa Clip in Car: which adapter to use please?

[amkoas]

they dont need to be brand specific.  they are under 10$ .  heres one http://www.pcconnection.com/ProductDetail?sku=7478293&oext=1038A&ci\_src=14110944&ci\_sku=7478293
and another
http://mobiledriven.stores.yahoo.net/usbcarchad.html